Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Allen-Bradley 20-COMM-D |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Product Type | DeviceNet Communication Adapter |
| Compatibility | PowerFlex 70, 700, 700H, 700S, 700L, 750, SMC Flex, SMC-50, DPI External Comms Kit |
| Communication Protocol | DeviceNet, DPI (Drive Peripheral Interface) |
| DeviceNet Data Rates | 125K, 250K, 500K, Autobaud, PGM (Program) |
| Node Address Range | 0-63 (configured via DIP switches or parameters) |
| Drive Electrical Consumption | 150 mA at 5V DC (supplied by host drive) |
| Network Electrical Consumption | 60 mA at 24V DC (supplied by DeviceNet network) |
| Connection Limits | 30 TCP connections; 16 simultaneous CIP messaging connections incl. 1 exclusive-owner I/O connection |
| Minimum RPI Rate | 5 ms |
| Packet Rate | Up to 400 total I/O packets per second (200 in, 200 out) |
| LED Indicators | 3 indicators (drive communications, adapter, network status) |
| Operating Temperature | -10 to 50°C (14 to 122°F) |
| Storage Temperature | -40 to 85°C (-40 to 185°F) |
| Relative Humidity | 5 to 95% non-condensing |
| Dimensions | 19 x 86 x 78.5 mm (length x height x depth) |
| Weight | Approx. 0.09 kg (0.19 lbs) |
| Certifications | UL, CE, cUL, EN61800-3 |
Main Features and Advantages
Flexible Configuration Options: The Allen-Bradley 20-COMM-D provides multiple configuration methods to suit different application needs. Series A versions feature 8 DIP switches for setting node address (switches 1-6, binary encoded for addresses 0-63) and data rate (switches 7-8) . The module also includes a J2 jumper for enabling/disabling the internal 120Ω bus termination resistor, which is critical for proper DeviceNet network termination . Alternatively, the switches can be set to “PGM” (Program) mode, allowing node address and data rate to be configured via parameters using configuration tools such as RSNetWorx for DeviceNet, DriveExplorer, or the PowerFlex HIM . The Allen-Bradley 20-COMM-D supports Autobaud detection, which automatically senses the network data rate at power-up for simplified installation .
Comprehensive Data Exchange and Messaging Support: The Allen-Bradley 20-COMM-D supports a wide range of data exchange methods to accommodate diverse application requirements. Polled, Cyclic, and Change of State (COS) data exchange are all supported, enabling efficient use of network bandwidth . The adapter supports Logic Command/Reference and up to four pairs of Datalinks, providing flexible I/O configuration for control and monitoring . The Allen-Bradley 20-COMM-D also supports Explicit Messaging and UCMM (Unconnected Message Manager) messages, allowing for detailed device configuration and diagnostics . The adapter can operate in Master-Slave or Peer-to-Peer hierarchies, enabling communication with scanners or direct drive-to-drive communication .
Advanced Fault Handling and Diagnostics: The Allen-Bradley 20-COMM-D includes robust fault handling features to ensure reliable operation. User-defined fault actions allow configuration of how the adapter and connected PowerFlex drive respond to communication disruptions or controller idle conditions . Faulted node recovery is supported, enabling configuration of devices even when they are in a faulted state on the network when using tools that support this feature and the data rate switch is set to “PGM” . The Allen-Bradley 20-COMM-D features three LED status indicators that report the status of drive communications, the adapter itself, and the DeviceNet network, providing clear visual diagnostics . The captive screws securing the adapter to the drive ensure reliable grounding and prevent loosening in high-vibration environments
